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The first newsletter we have here (Jan 2016) is Volume 26, No. 5, implying that the newsletter was first published in Fall 2000. We have no copies of earlier editions.
OGS Quarterly Journals
Quarterly Journals began in Jan 1975 (Volume 1) and ended Jan 2016 (Volume 42).
Missing editions: Jul and Oct 2015, which may not have been published.